Installation tool for helical threaded insert

ABSTRACT

An installation tool for helical threaded insert includes a driving section, a series of driving shafts and a series of head tubes. When a user wants to rebuild a broken screw hole, the user can choose one driving shaft and head tube with suitable size for rebuilding the broken screw hole. Furthermore, a threaded hole of the head tube can adjust the size of the helical threaded insert for matching the broken screw hole so that the user can rebuild the screw hole easily.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a threaded insert installation, and more particularly to an installation tool for helical threaded insert.

2. Description of Related Art

To reinforce the tenacity of the screw hole during a screw operating, the operators usually insert a helical threaded insert into the screw hole. When the screw hole is formed as low-tenacity material such as plastic or wood . . . etc., the helical threaded insert is necessary to be inserted into the screw hole for avoiding the damage of the screw hole. Furthermore, the common-used screw holes often damaged after long-term screwing. Thus, the operators usually use the tapping machine to rebuild the thread structure of the screw hole. However, the diameter of the rebuilt screw hole will become too large to fasten the screw. In order to solve this problem, the helical threaded insert is necessary to be inserted into the rebuilt screw hole for maintaining the correct size corresponding to the screw.

A conventional threaded insert installation includes a hand tube. The hand tube has a driving shaft therein. A handle is connected to the rear end of the driving shaft and a recess is formed on the front end of the driving shaft. The recess can attach the helical threaded insert. When the operator wants to rebuild one broken screw hole, the operator uses the drill to break the thread structure of the broken screw hole for enlarging the screw hole at first. Next, the operator holds the hand tube by one hand and rotates the handle toward the screw hole by another hand to insert the helical threaded insert into the screw hole. However, the helical threaded insert cannot always match to the size of the screw hole.

The conventional threaded insert installation has two benefits. One is that the threaded insert installation can change the multiple sizes of the head tubes and the driving shafts corresponding to the threaded inserts. Another is that the threaded insert installation can be made by fewer materials. However, it's inconvenient to insert the helical threaded inserts into the screw hole because the diameter of the helical threaded insert is usually larger than the diameter of the screw hole. Thus, the operator must keep rotating the tool and screwing the helical threaded insert until the helical threaded insert will be into the screw hole.

The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional. Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an improved threaded insert installation.

To achieve the objective, an installation tool for helical threaded insert comprises a driving section having an internal tube and an external tube, the internal tube received in the external tube and being able to move in or out relative to the external tube, at least one driving shaft passing through an inner side of the external tube, the driving shaft detachably connected to the internal tube, the driving shaft having a driving end at one end for attaching to a helical threaded insert, at least one head tube detachably connected to one end of the external tube, the driving end of the driving shaft being able to pass through the head tube, the head tube having a receiving space at one end for connecting to the driving end with the helical threaded insert, a threaded hole formed at another end of the head tube for adjusting the size of the helical threaded insert before the helical threaded insert being inserted into a screw hole, a lock ring formed on the internal tube for limiting the movable distance of the internal tube in the external tube, an L-shaped handle disposed at one end of the internal tube thereby a user can easily operate the L-shaped handle to insert the helical threaded insert, a polygon recess defined at another end of the internal tube for receiving the driving shaft, the driving shaft having a polygon section for connecting to the polygon recess of the internal tube, the internal tube having a magnetic portion formed on an inside wall of the polygon recess for connecting the internal tube to the driving shaft firmly, the diameters of the threaded hole decreasing gradually toward the screw hole thereby the helical threaded insert is easily inserted into the threaded hole and the size of the helical threaded insert is adjusted to match the size of the screw hole, an internal thread corresponding to the head tube defined on the inside wall of the external tube for connecting the external tube to the head tube, an external thread formed after the receiving space of the head tube, the external thread engaged with the internal thread, an anti-slip surface formed on the outside peripheral of the external tube;

wherein the driving end is adjusted and received in the receiving space by moving the internal tube in or out relative to the external tube; the threaded hole is aimed at the screw hole for inserting the helical threaded insert into the screw hole after the helical threaded insert passes through the receiving space and the helical threaded insert is attached to the driving end, thereafter the internal tube is pushed and rotated to compress the helical threaded insert into the threaded hole such that the size of helical threaded insert is adjusted to match the size of the screw hole.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of an installation tool for helical threaded insert of the present invention;

FIG. 2 is an assembled view of the installation tool for helical threaded insert of the present invention;

FIG. 3 is a partial cross-sectional view for showing an inclining structure of a threaded hole;

FIG. 4-6 are assembled views for showing the helical threaded insert inserted into the screw hole by the present invention; and

FIG. 7 is a perspective view for showing the installation tool for helical threaded insert received in a box.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings to FIGS. 1-7, an installation tool for helical threaded insert in accordance with the present invention comprises a driving section 10. The driving section 10 has an internal tube 11 and an external tube 12. The internal tube 11 is received in the external tube 12 and is able to move in or out relative to the external tube 12. At least one driving shaft 20 passes through an inner side of the external tube 12 and the driving shaft 20 is detachably connected to the internal tube 11. The driving shaft 20 has a driving end 21 at one end for attaching to a helical threaded insert 40. The driving shaft 20 has a polygon section 22 at another end for connecting to the internal tube 11. At least one head tube 30 is detachably connected to one end of the external tube 12. The driving end 21 of the driving shaft 20 is able to pass through the head tube 30. The head tube 30 has a receiving space 31 at one end for connecting to the driving end 21 with the helical threaded insert 40. A threaded hole 32 is formed at another end of the head tube 30 for adjusting the size of the helical threaded insert 40 before the helical threaded insert 40 being inserted into a screw hole 50.

The driving end 21 is adjusted and received in the receiving space 31 by moving the internal tube 11 in or out relative to the external tube 12. After the helical threaded insert 40 passes through the receiving space 31 and the helical threaded insert 40 is attached to the driving end 21 (as shown in FIG. 4), the threaded hole 32 is aimed at the screw hole 50 for inserting the helical threaded insert 40 into the screw hole 50. When the internal tube 11 is pushed and rotated to compress the helical threaded insert 40 into the threaded hole 32, the size of helical threaded insert 40 is adjusted to match the size of the screw hole 50. Consequently, the helical threaded insert 40 is inserted into the screw hole 50 smoothly (as shown in FIGS. 5 and 6).

Furthermore, a lock ring 111 is formed on the internal tube 11 for limiting the movable distance of the internal tube 11 in the external tube 12. An L-shaped handle 112 is disposed at one end of the internal tube 11 and the L-shaped handle is vertical to the internal tube 11, thereby a user can easily operate the L-shaped handle 112 to insert the helical threaded insert 40. A polygon recess 113 is defined at another end of the internal tube 11 for receiving the driving shaft 20. The driving shaft 20 has a polygon section 22 for connecting to the polygon recess 113 of the internal tube 11. The internal tube 11 has a magnetic portion 114 formed on an inside wall of the polygon recess 113 for connecting the internal tube 11 to the driving shaft 20, thereby the internal tube 11 firmly connects to the driving shaft 20 and the driving shaft 20 is difficult to fall off during operation. The diameters of the threaded hole 32 decreases gradually toward the screw hole 50 (as shown in FIG. 3), thereby the helical threaded insert 40 is easily inserted into the threaded hole 32 and the size of the helical threaded insert 40 is adjusted to match the size of the screw hole 50. An internal thread 121 corresponding to the head tube 30 is defined on the inside wall of the external tube 12 for connecting the external tube 12 to the head tube 30. An external thread 33 is formed after the receiving space 31 of the head tube 30. The external thread 33 is engaged with the internal thread 121. In this embodiment, the external tube 12 is connected to the head tube 30 by the thread structure thereby the user can quickly assemble the present invention. An anti-slip surface 122 is formed on the outside peripheral of the external tube 12. Thus, the user can operate the tool stably during the operation.

The present invention comprises a series of the driving shafts 20 and a series of the head tubes 30. When the user wants to rebuild the broken screw hole 50, the user only alternates some suitable driving shaft 20 and head tube 30 for matching the screw hole 50. Thus, there are two benefits in the present invention. First, the user only carry one driving section 10 and some suitable driving shaft 20 and head tube 30 for their task. Second, the helical threaded insert 40 can be adjusted to match the size of the broken screw hole 50 by the threaded hole 32 so that the user can insert the helical threaded insert 40 into the screw hole 50 smoothly.

Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed. 

1. An installation tool for helical threaded insert comprising: a driving section having an internal tube and an external tube, the internal tube received in the external tube and being able to move in or out relative to the external tube; at least one driving shaft passing through an inner side of the external tube, the driving shaft detachably connected to the internal tube, the driving shaft having a driving end at one end for attaching to a helical threaded insert; and at least one head tube detachably connected to one end of the external tube, the driving end of the driving shaft being able to pass through the head tube, the head tube having a receiving space at one end for connecting to the driving end with the helical threaded insert, a threaded hole formed at another end of the head tube for adjusting the size of the helical threaded insert before the helical threaded insert being inserted into a screw hole; wherein the driving end is adjusted and received in the receiving space by moving the internal tube in or out relative to the external tube; the threaded hole is aimed at the screw hole for inserting the helical threaded insert into the screw hole after the helical threaded insert passes through the receiving space and the helical threaded insert is attached to the driving end, thereafter the internal tube is pushed and rotated to compress the helical threaded insert into the threaded hole such that the size of helical threaded insert is adjusted to match the size of the screw hole.
 2. The installation tool for helical threaded insert as claimed in claim 1, wherein a lock ring is formed on the internal tube for limiting the movable distance of the internal tube in the external tube.
 3. The installation tool for helical threaded insert as claimed in claim 1, wherein an L-shaped handle is disposed at one end of the internal tube, thereby a user can easily operate the L-shaped handle to insert the helical threaded insert.
 4. The installation tool for helical threaded insert as claimed in claim 2, wherein an L-shaped handle is disposed at one end of the internal tube, thereby a user can easily operate the L-shaped handle to insert the helical threaded insert.
 5. The installation tool for helical threaded insert as claimed in claim 1, wherein a polygon recess is defined at another end of the internal tube for receiving the driving shaft, the driving shaft having a polygon section for connecting to the polygon recess of the internal tube, the internal tube having a magnetic portion formed on an inside wall of the polygon recess for connecting the internal tube to the driving shaft firmly.
 6. The installation tool for helical threaded insert as claimed in claim 1, wherein the diameters of the threaded hole decreases gradually toward the screw hole, thereby the helical threaded insert is easily inserted into the threaded hole and the size of the helical threaded insert is adjusted to match the size of the screw hole.
 7. The installation tool for helical threaded insert as claimed in claim 1, wherein an internal thread corresponding to the head tube is defined on the inside wall of the external tube for connecting the external tube to the head tube, an external thread formed after the receiving space of the head tube, the external thread engaged with the internal thread.
 8. The installation tool for helical threaded insert as claimed in claim 1, wherein an anti-slip surface is formed on the outside peripheral of the external tube. 